Requires PostmarketOS which only has less than 30 phones it's available for, many of which are very old (Samsung Galaxy S III??? Where would you even find one of these anymore?) and out of the list of less-than-thirty at least five of them don't offer full support, only partial.
The newest Pixel phone you can use is a Pixel 3a.
Yeah I think I'll pass on something that requires PostmarketOS.
I think commenter is not mad at postmarketOS itself, but the article making it look like you can 1) use docker on Android (at least thats what Android Smartphone infers) and 2) that you can use it with devices such as the pretty new oneplus 6t
For sure, this isn't against PostmarketOS. PMOS is fine. It's rather if I'm trying to set up Docker on a phone, I'd rather find a way that's... less limiting on what hardware can be used.
I mean it's pretty easy to extrapolate from the article how to do it with any OS that can run Docker. It's the idea of recycling the phone as a server that's useful not the specific OS they used in the tutorial.